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/*
* LibraryViewerPanel.java
* -----------------------
*
* Part of the URY Frontend Platform
*
* V0.00 2011/03/20
*
* (C) 2011 URY Computing
*/
package uk.org.ury.library.viewer;
import java.util.ResourceBundle;
import java.util.concurrent.ExecutionException;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingWorker;
import uk.org.ury.frontend.FrontendMaster;
import uk.org.ury.frontend.FrontendModulePanel;
import uk.org.ury.frontend.HintField;
import uk.org.ury.frontend.exceptions.UICreationFailureException;
import uk.org.ury.library.exceptions.EmptySearchException;
import uk.org.ury.protocol.exceptions.InvalidMessageException;
/**
* Frontend panel providing access to an underlying library viewer.
*
* @author Matt Windsor
* @author Nathan Lasseter
*/
public class LibraryViewerPanel extends FrontendModulePanel {
/**
*
*/
private static final long serialVersionUID = -2441616418398056712L;
/* Panel widgets exposed by the SwiXML user interface. */
private JTable resultsTable;
private JScrollPane resultsPane;
private JPanel messagePanel;
private JLabel messageLabel;
private JPanel searchingPanel;
private JLabel searchingLabel;
private JTextField searchField;
private JButton searchButton;
private JLabel searchForLabel;
private HintField hint;
/*
* This contains the last search failure message, for use in letting the
* user know what happened.
*/
private String searchFailureMessage;
// Resource bundle.
private ResourceBundle rb;
/**
* Construct a new LibraryViewerPanel.
*
* @param viewer
* The LibraryViewer controlling this LibraryViewerPanel.
*
* @param master
* The FrontendMaster driving the frontend.
*
* @throws UICreationFailureException
* if the UI creation fails.
*/
public LibraryViewerPanel(LibraryViewer viewer, FrontendMaster master)
throws UICreationFailureException {
/*
* The UI implementation is contained in library_viewer_gui.xml.
*
* See this file for more details.
*/
super(viewer, "library_viewer_gui.xml", master);
// Fill in locale-specific data.
rb = ResourceBundle
.getBundle("uk.org.ury.library.viewer.LibraryViewer");
searchFailureMessage = rb.getString("ERR_UNKNOWN");
searchingLabel.setText(rb.getString("MSG_SEARCHING"));
searchForLabel.setText(rb.getString("LBL_SEARCHFOR"));
searchButton.setText(rb.getString("BTN_SEARCH"));
hint.setText(rb.getString("HINT"));
// Fine-tune table
resultsTable.setAutoCreateRowSorter(true);
}
/**
* @return the name of the panel.
*
* @see uk.org.ury.frontend.FrontendModulePanel#getModuleName()
*/
@Override
public String getModuleName() {
return rb.getString("MODULE_NAME");
}
/**
* Action method for performing a search, bound by the UI XML manifest to
* the search field and button.
*/
public void search() {
/*
* We can't let the user search while another search is going on, but
* it's not good to let the search "freeze" the UI.
*
* Hence the search function disables all sensitive parts of the
* interface and launches a search as a background process.
*
* We also swap the results table or no-results panel out for a panel
* that says "Searching...", in the interests of user-friendliness.
*/
searchField.setEnabled(false);
searchButton.setEnabled(false);
resultsPane.setVisible(false);
messagePanel.setVisible(false);
searchingPanel.setVisible(true);
searchingLabel.setText(String.format(rb.getString("MSG_SEARCHING"),
searchField.getText()));
final LibraryViewer master = (LibraryViewer) getModule();
SwingWorker<Boolean, Void> worker = new SwingWorker<Boolean, Void>() {
private String searchTerm = "";
/**
* Perform a task in a separate thread from event-dispatch.
*
* In this case, perform a search.
*
* @return whether or not the search was successful.
*/
@Override
public Boolean doInBackground() {
searchTerm = searchField.getText();
try {
master.doSearch(searchTerm);
} catch (InvalidMessageException e) {
searchFailureMessage = String.format(
rb.getString("ERR_SEARCH_FAILED"), searchTerm,
e.getMessage());
return false;
} catch (EmptySearchException e) {
searchFailureMessage = rb.getString("ERR_EMPTY_SEARCH");
return false;
}
return true;
}
/**
* Perform post-search cleanup and finalisation.
*/
@Override
public void done() {
// Figure out whether or not the search succeeded.
boolean hasSucceeded = false;
try {
hasSucceeded = this.get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
searchFailureMessage = String.format(
rb.getString("ERR_SEARCH_FAILED"), searchTerm,
e.getMessage());
}
/*
* Re-enable widgets and swap panels according to whether or not
* results were found.
*/
searchField.setEnabled(true);
searchButton.setEnabled(true);
searchingPanel.setVisible(false);
if (hasSucceeded == false) {
messageLabel.setText(searchFailureMessage);
messagePanel.setVisible(true);
} else if (master.getLibraryList().size() == 0) {
messageLabel.setText(String.format(
rb.getString("ERR_NO_RESULTS"), searchTerm));
messagePanel.setVisible(true);
} else {
// Force table update with new results.
resultsTable.setModel(new LibraryTableModel(master
.getLibraryList()));
messagePanel.setVisible(false);
resultsPane.setVisible(true);
}
}
};
worker.execute();
}
}
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